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gpio: gpio-mxc: Fix race in installing chained IRQ handler

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Fix a race where a pending interrupt could be received and the handler
called before the handler's data has been setup, by converting to
irq_set_chained_handler_and_data().

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Alexandre Courbot <gnurou@gmail.com>
Cc: Hans Ulli Kroll <ulli.kroll@googlemail.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/E1Z4z0C-0002SX-Lj@rmk-PC.arm.linux.org.uk
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Russell King 2015-06-16 23:06:40 +01:00 committed by Thomas Gleixner
parent 7f77c5c39d
commit e65eea54e9
1 changed files with 6 additions and 7 deletions
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13
drivers/gpio/gpio-mxc.c
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@ -437,14 +437,13 @@ static int mxc_gpio_probe(struct platform_device *pdev)
irq_set_chained_handler(port->irq, mx2_gpio_irq_handler);
} else {
/* setup one handler for each entry */
irq_set_chained_handler(port->irq, mx3_gpio_irq_handler);
irq_set_handler_data(port->irq, port);
if (port->irq_high > 0) {
irq_set_chained_handler_and_data(port->irq,
mx3_gpio_irq_handler, port);
if (port->irq_high > 0)
/* setup handler for GPIO 16 to 31 */
irq_set_chained_handler(port->irq_high,
mx3_gpio_irq_handler);
irq_set_handler_data(port->irq_high, port);
}
irq_set_chained_handler_and_data(port->irq_high,
mx3_gpio_irq_handler,
port);
}
err = bgpio_init(&port->bgc, &pdev->dev, 4,